Check valved nozzle



Dec. 9, 1952 B. PlERONl k CHECK VALVED NOZZLE Filed Nov. 10. 1948 l m m0H m n 0 IN V EN TOR.

By MMW Patented Dec. 9, 1952 EIQE 2 Claims.

This invention relates to domestic oil burning heating units, and moreparticularly to means for curing the faults found in many of thepresently installed units.

As is well known many of the presently installed domestic oil burningheating units comprise, a blower, a bellows valve, and a dischargenozzle. In operation, the blower is automatically rendered operative inresponse to a drop in temperature in a room to be heated to apredetermined value. When the blower is thus rendered operative itbuilds up pressure sufiicient to force the bellows valve open and toforce oil from a suitable source of supply through the valve into thenozzle from whence it is discharged in the form of a spray into acombustion chamber where it is ignited by means of an electric spark.Thereafter, when the temperature in the room increases to apredetermined value the blower is automatically rendered inoperative atwhich time the bellows valve closes to prevent further feed of oil intothe combustion chamber.

While in general, such heating units are satisfactory, they are open tothe objection that when the blower stops and the bellows valve closes,the oil in the line between the bellows valve and the nozzle instead ofbeing discharged into the combustion chamber in the form of a spraywhich is needed to insure combustion thereof simply drips into thecombustion chamber and remains unburned. This unburned fuel, due to theresidual heat in the chamber, vaporizes and so creates gases with theresult that when the blower is again rendered operative and the sparkcreated an explosion frequently results.

Still another objection to such units is the fact that frequently, thebellows valve fails to completely shut off the flow of oil to the nozzlewith the result that a slow leak of oil into the combustion chambertakes place. As explained above, this oil vaporizes and creates gaseswhich frequently explode when the blower is rendered operative and theignition spark is created.

In accordance with the present invention, the above noted as well asother objections are obviated by means of a check valve which is adaptedand arranged to be coupled to the discharge nozzle without anymodification thereof. This valve is set so that when the blower starts,it, as well as the bellows valve, opens to admit the inflow of oil tothe discharge nozzle and closes to prevent the inflow of oil to thenozzle when the blower stops and the pressure created thereby drops to apredetermined value. The check valve being coupled to the dischargenozzle serves to trap the oil in the feed line between the bellows valveand the discharge nozzle and s0 prevents it from dripping into thecombustion chamber. Also, it serves to prevent the inflow of oil intothe combustion chamber in the event the bellows valve fails tocompletely shut off the supply of oil to the feed pipe leading to thedischarge nozzle.

For a clear understanding of the invention reference may be made to theaccompanying drawing wherein the invention has been shown merely by wayof example and in preferred form. Obviously, however, many variationsand modifications may be made therein which will still be comprisedwithin its spirit. It is to be understood, therefore, that the inventionis not to be limited to any specific form or embodiment except in so faras such limitations are specified in the appended claims.

Referring to the drawings- Fig. l is a plan view of a discharge nozzlehaving a check valve operatively connected thereto;

Fig. 2 is a sectional view taken along line 2-2 of Fig. 1; and

Fig. 3 is an exploded view of the check valve showing its componentparts.

Referring to the drawings It! represents a discharge nozzle of the typecommonly used in connection with a domestic oil burning heating unit. Asis well known, such nozzles, in general, comprise a housing H having avalve member I2 threaded therein. As usual, the housing II is providedwith an externally threaded portion l3 by means of which it may becoupled to the feed line (not shown) leading from a bellows Valve (notshown).

In accordance with the present invention, the nozzle I I] is providedwith a check valve which in the present embodiment of the inventioncomprises a housing member l4 threaded externally at one end to enableit to be coupled to the housing H behind the stem of the valve member[2. Adjacent its other end, the housing member I4 is provided with anannular groove IS. A plurality of input ports It leads from the annulargroove IE to an inlet chamber I8 which opens into an outlet chamber Mathrough the shoulder 15. The input ports I! are protected against theinflow of solid matter by means of a screen filter l9 positioned aboutthe housing member [4.

A valve 29 is positioned in the housing member l4. Preferably, the valve20 is made by securing to a suitable holder 2! a facing 22 ofnon-metallic material such as any one of the commercial synthetics(neoprene) which is resistant to the corrosive action of oil. It is tobe understood, however, that the valve 29 may be made entirely of oilresistant material. Normally, the valve 20 is maintained pressed againstthe shoulder l5 so as to maintain the inlet chamber l8 closed by meansof a spring 23 positioned between the valve 20 and an apertured disk 25threaded into the tubular member 54. Alternatively, the disk 24 may bedispensed with and the spring 23 positioned between the valve 20 and thestemof the valve member I2 threaded into the housing H.

In operation, when the blower starts in response to a drop intemperature in a room to be heated to a predetermined value and thebellows valve opens, oil is forced through the feed line, through thefilter [9, through the in put ports I! which lead from the annulargroove I 6 and into the inlet chamber l3 which, as stated heretofore, isnormally maintained closed by the valve 20 being pressed against'theshoulder i5 by means'of the spring23. The pressure exerted by the spring23, however, is soadjusted by means of thedisk'24 that it yields 2113501slightly below the pressure exerted by the blower. Under theseconditions, thevalve 20 opens and-sopermits the oil'tobe forced throughthe housing member l4; into the discharge nozzle through radial slots 25in the threaded portion of the adjustable'valve from whence it'isdischarged into the combustion chamber and ignited in the usual manner.Thereafter, when the'blower stops in response to an increasein'temp'erature in the room to be heated-and the pressure drops,both'the bellows valveand the check valve close to prevent further feedof 'oil' into the discharge nozzle. Under these conditions, the oil inthe feed pipe between the bellows valve'and the discharge nozzle whichheretofore used to drip into the combustion chamber is trapped betweenthe-twovalves. In addition, in the event the bellows valvefails tofunction inthe manner intended, thecheck valve serves to preventdischarge of oil-which leaks therethrough into the combustion chamber.

Having thus described my'invention, Iclaim:

1. A discharge nozzle-comprising a forward housingmember, an aperturedadjustable discharge valve internally threaded to said -forward housingmemben-arearwardly disposed housing 'adapted'to be-coupled tosaidforward housing and having therein a plurality of inlet ports leadingradially into said housing, a valve seat formed within said housing, avalve adapted to seat against said valve seat, a spring to exertpressure against said valve, a disk threadably coupled downstream ofsaid spring to maintain pressure exerted by said spring upon said valve,said disk being apertured to permit flow between the chamber upstream ofsaid disk and-the chamber downstream of said disk.

2. A discharge nozzle comprising a discharge element, said dischargeelement being composed of a housing having an opening for the dischargeof. fuel, and an internal threadably coupled valve having aperturesthrough its threaded portion, a check valve element coupled with saidfirst housing, an annular recess provided therein, openings in saidrecess to provide ingress for fuel, a passage, a valve seat formed atthe downstream end of said passage, said check valve element'beingfurther'prov-ided with a valve normally seating'in saidvalve'seat,a-spring maintaining closingpressure against said valve, 'a disk,threadably coupled downstream with'respect' to said spring and abuttingit and 'apertured about its'periphery'to permit passage'of fuel between'the chambersup'stream of -said disk and downstream of" said disk, saiddisk providing an adjustablemeans whereby the closing force of saidspring upon said valve maybealtered.

BRUNO PIERONI.

REFERENGES CITED The following references are of'record inthe

